The following options can be used with the --enable-comms= option to target different communication interfaces:
<comm> |
Description |
|---|---|
none |
no communications |
mpi |
MPI communications using MPI-3 shared memory |
mpi-auto |
MPI communications with compiler CXX but clone flags from MPICXX |
For the MPI interfaces the optional -auto suffix instructs the configure scripts to determine all the necessary compilation and linking flags. This is done by extracting the informations from the MPI wrapper specified in the environment variable MPICXX (if not specified configure will scan though a list of default names). The -auto suffix is not supported by the Cray environment wrapper scripts. Use the standard wrappers ( CXX=CC ) set up by Cray PrgEnv modules instead.
Shared memory communications support
The following options can be use with the --enable-shm= option to target different shared memory behaviours (default shmopen):
<shm> |
Description |
|---|---|
shmnone |
uses anonymous spaces, use only for 1 MPI rank per node |
shmopen |
uses shm_open to allocate a shared memory space for inter socket communications. Uses a unique file name in /dev/shm associated to the user. |
hugetlbfs |
optional libhugetlbfs support to map the shared memory allocation into huge 2M pages |
Other flags
--enable-shmpath=<path> to select the shared memory map base path for libhugetlbfs.